Stainless Steel Water Flow Indicator
SS304 / SS316 Saddle · DN100–DN200 · Corrosion-Resistant · 1.6 MPa · IP66
Stainless Steel Water Flow Indicator for Corrosive Environments
The CA-FIRE stainless steel water flow indicator is engineered for fire sprinkler installations where standard epoxy-coated ductile iron would eventually corrode — coastal high-rises, tropical humid climates, marine environments, desalination plants, chemical facilities and mining sites. The fully stainless-steel saddle, paddle vane and internal hardware deliver multi-decade service life without rust, pitting or coating failure.
Three Reasons to Upgrade from Ductile Iron to Stainless
The ductile iron saddle water flow indicator is the workhorse of the fire sprinkler industry — but in certain environments, the epoxy coating that protects its body eventually breaks down. When that happens, the indicator itself still works, but the saddle and U-bolts corrode in place, making service replacement difficult and compromising the pipe seal. The stainless steel variant eliminates this failure mode at the material level.
SS304 vs SS316 — Which Grade Do You Need?
Both SS304 and SS316 are austenitic stainless steels suitable for fire sprinkler water flow indicators. The difference is the addition of 2 to 3 percent molybdenum in SS316, which dramatically improves resistance to chlorides and pitting corrosion. Select by the aggressiveness of the environment — in many projects SS304 is more than sufficient, but for direct marine service or chloride exposure, SS316 is the correct specification.
- Coastal high-rise buildings (non-splash)
- Tropical humid climates (SE Asia, Africa)
- Indoor commercial & residential projects
- Hotels, shopping malls, airports
- Car parks, basements, plant rooms
- General industrial buildings
- Direct marine splash zones
- Offshore platforms, ships, ports
- Desalination plants & seawater cooling
- Chemical processing facilities
- Swimming-pool & spa plant rooms (chlorine)
- Pulp & paper, fertilizer plants
Full Technical Specifications
The stainless steel variant shares the same electrical, actuation and signal-output platform as the standard ductile iron ZSJZ series — wiring and FACP programming are identical. Only the wetted and external materials differ.
Table 1 — Electrical & Mechanical
| Parameter | Specification |
|---|---|
| Model | ZSJZ-SS (DN100 / DN150 / DN200) |
| Body material | SS304 (standard) or SS316 (optional, specify on order) |
| Paddle material | SS304 or SS316 flexible vane (matches body grade) |
| Shaft & fasteners | SS304 or SS316 (matches body grade) |
| Gasket material | EPDM rubber (FKM optional for chemical service) |
| Working pressure | 1.6 MPa (16 bar / ~230 psi) maximum |
| Media temperature | 4°C to 70°C |
| Ambient temperature | −10°C to +55°C |
| Switch type | Hall-effect micro-switch, sealed |
| Contact form | Two sets of normally closed (NC) contacts |
| Contact rating | DC24V 1A / AC220V 0.5A |
| Enclosure rating | IP66 |
| Cable entry | M20 × 1.5 threaded cable gland (SS316 gland optional) |
| Corrosion test | Salt spray tested per ASTM B117 |
| Mounting orientation | Horizontal or vertical pipe (head upright) |
Table 2 — Dimensions & Alarm Flow by Pipe Size
| Pipe DN | Drilled Hole Size | Working Pressure | Alarm Flow Rate | Contact Rating | Contact Form |
|---|---|---|---|---|---|
| DN100 | 50 mm | 1.6 MPa | 22 L/min | DC24V 1A / AC220V 0.5A | 2× NC |
| DN150 | 50 mm | 1.6 MPa | 30 L/min | DC24V 1A / AC220V 0.5A | 2× NC |
| DN200 | 84 mm | 1.6 MPa | 33 L/min | DC24V 1A / AC220V 0.5A | 2× NC |
Where the Stainless Steel Variant Is Mandatory
These environments will corrode a standard epoxy-coated ductile iron saddle within years, not decades. In every case below, stainless steel is the correct material choice for a life-safety device expected to last the lifetime of the building.
Factory-Direct Export Terms
Stainless steel units are cast and finished to order, so lead time is longer than the standard ductile iron variant. SS316 adds a further 5 to 7 days to the schedule versus SS304. Contact our sales team for firm project pricing, LC terms and OEM enquiries.
